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BH1414K
Multimedia ICs
Wireless Audio Link IC
BH1414K
The BH1414K is a FM stereo transmitter IC that uses a simple configuration. This IC consists of a stereo modulator for generating stereo composite signals and a FM transmitter for broadcasting a FM signal on the air. A high S/N ratio and good timbre transmitter circuit can be composed with a few components. It is available for many applications due to the varieties of setting such as transmission output by serial data input.
!Applications CD changer, Car TV, Car navigation, Wireless speakers, Personal computer (sound board), Game machine
!Features 1) It is possible to improve the timbre because it has the pre-emphasis circuit, limiter circuit, and the 19kHz/38kHz low-pass trap filter circuit. 2) Built-in pilot-tone system FM stereo modulator circuit. 3) The transmission frequency is stable because it has a PLL system for the FM transmitter circuit. 4) PLL data input (CE, CK, DA) by serial input. 5) It is possible for input level setting, monaural operation and output ON/OFF control by serial input. 6) It is possible for the transmission output control.
!Absolute maximum ratings (Ta = 25C)
Parameter Supply voltage Power dissipation Storage temperature range Symbol VCC1 VCC2 Pd Tstg Limits +9.0 +10.0 500 -55 to +125 Unit V mW C
Reduced by 5mW for each increase in Ta of 1C over 25C.
!Recommended operating conditions (Ta = 25C)
Parameter Operating supply voltage Operating temperature range Audio input level Audio input frequency Transmission frequency Symbol VCC Topr VIN-A fIN-A fTX Min. 4.5 -40 - 20 75 Typ. - - - - - Max. 5.5 +85 500 15k 110 Unit V C mVrms Hz MHz
1/3
BH1414K
Multimedia ICs
!Application example
56 TXOUT
100
GND
100
1000p
270p
FEM10C-3F6
68p
4700p
5 6
1 10
BC
300
33p
10k
1k
100p
33p
10k
OFF
ON
200
PORT
1000p
15p
33p
33
32
31
30
29
28
27 GND3
26
25 VCC3
24
15p
68
23
10k
470p
18p
RF
7.6MHz
RF OSC 22
0.47
34
+ -
82k
35
18p VCC
Shift register
36 VCC2
0.1
1 4
1 19 1 50 1 2
Phase detector
20
120k 330p
100k
6.8k
Program countor
REF
21
100
100
4.7 20k 10k
GND
37 GND2
19
20k
38 GND1
330
MUTE
18
REF 39
0.01
VCC 2
VCC1 17
22
40
4.7
MPX
16
4.7
41
0.01 0.01
19k/38kHz LPF
LIMITER
LIMITER
19k/38kHz LPF
15
0.01 0.01
42
EVR
EVR
14
43
0.01
+ - - +
13
0.01
44
REF
REF
12
1
0.01
2
3
1k 0.01 (620)
4
5
6
7
8
1k
9
10
0.01
11
10k
51k
10k
0.01 (620)
1000p
1
L-IN
GND
R-IN
The constant of the capacitor must be determined by the agreement with a crystal maker.
1
1000p
51k
51k
4.7
10k
2/3
BH1414K
Multimedia ICs
!External dimensions (Units : mm)
14.00.3 10.00.2
33 23 22 34
14.00.3 10.00.2
44
12
1
11
0.150.1
2.150.1 0.05
0.8
0.350.1
QFP44
1.2
0.15
3/3
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product described in this document are for reference only. Upon actual use, therefore, please request that specifications to be separately delivered. Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. Any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer. Products listed in this document use silicon as a basic material. Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of with would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. About Export Control Order in Japan Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control Order in Japan. In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause) on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
Appendix1-Rev1.0

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